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语法格式：
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语法格式：
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其中 start 为起始值，step为步长，end为终止值
当步长为1时可省略 step 参数，st,"/>
    
    
    
    
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语法格式：
1（start:step:end）

其中 start 为起始值，step为步长，end为终止值
当步长为1时可省略 step 参数，st,"/>
    
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        <h1 class="title">05_空间向量表示</h1>
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            <span>三月 31, 2022</span>
            
  <ul class="post-tags-list" itemprop="keywords"><li class="post-tags-list-item"><a class="post-tags-list-link" href="/tags/MATLAB%E5%AD%A6%E4%B9%A0/" rel="tag">MATLAB学习</a></li></ul>


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            <h1 id="五、空间向量表示"><a href="#五、空间向量表示" class="headerlink" title="五、空间向量表示"></a>五、空间向量表示</h1><p>1.用线性等间距生成向量矩阵</p>
<ul>
<li><p>语法格式：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">（start:step:<span class="keyword">end</span>）</span><br></pre></td></tr></table></figure>

<p>其中 <strong>start</strong> 为起始值，<strong>step</strong>为步长，<strong>end</strong>为终止值</p>
<p>当步长为<strong>1</strong>时可省略 <strong>step</strong> 参数，<strong>step</strong>  也可以去负数</p>
</li>
<li><p>程序命令：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">a=[<span class="number">5</span>:<span class="number">-0.5</span>:<span class="number">1</span>]</span><br></pre></td></tr></table></figure>
</li>
<li><p>结果：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">a =</span><br><span class="line"></span><br><span class="line">  列 <span class="number">1</span> 至 <span class="number">6</span></span><br><span class="line"></span><br><span class="line">    <span class="number">5.0000</span>    <span class="number">4.5000</span>    <span class="number">4.0000</span>    <span class="number">3.5000</span>    <span class="number">3.0000</span>    <span class="number">2.5000</span></span><br><span class="line"></span><br><span class="line">  列 <span class="number">7</span> 至 <span class="number">9</span></span><br><span class="line"></span><br><span class="line">    <span class="number">2.0000</span>    <span class="number">1.5000</span>    <span class="number">1.0000</span></span><br><span class="line"></span><br></pre></td></tr></table></figure></li>
</ul>
<p>2.线性及对数空间表示</p>
<p>（1）线性空间表示</p>
<ul>
<li><p>语法格式：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">linspace</span>(n1,n2,n)</span><br></pre></td></tr></table></figure>

<p>在线性空间上，行矢量的值从<strong>n1</strong> 到 <strong>n2</strong> ,等分位数为 <strong>n</strong> ，默认 <strong>n</strong> 为 <strong>100</strong></p>
</li>
<li><p>程序命令：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">a=<span class="built_in">linspace</span>(<span class="number">1</span>,<span class="number">10</span>,<span class="number">10</span>)</span><br></pre></td></tr></table></figure>
</li>
<li><p>结果：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">a =</span><br><span class="line"></span><br><span class="line">     <span class="number">1</span>     <span class="number">2</span>     <span class="number">3</span>     <span class="number">4</span>     <span class="number">5</span>     <span class="number">6</span>     <span class="number">7</span>     <span class="number">8</span>     <span class="number">9</span>    <span class="number">10</span></span><br></pre></td></tr></table></figure></li>
</ul>
<p>（2）对数空间表示</p>
<ul>
<li><p>语法格式：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">logspace</span>(n1,n2,n)</span><br></pre></td></tr></table></figure>

<p>在对数空间上，行矢量的值从 <img src="https://s2.loli.net/2022/03/30/EFl14Djn8dBPg5e.jpg" alt="f73e8a647c47500456bbf2b6f625a93" style="zoom:33%;" />，数据个数为<strong>n</strong> ，默认 <strong>n</strong>为50 </p>
<p>这个指令为建立对数领域轴坐标</p>
</li>
<li><p>程序命令：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">a=<span class="built_in">logspace</span>(<span class="number">1</span>,<span class="number">4</span>,<span class="number">4</span>)</span><br></pre></td></tr></table></figure>
</li>
<li><p>结果：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">a =</span><br><span class="line"></span><br><span class="line">          10         100        1000       10000</span><br><span class="line"></span><br></pre></td></tr></table></figure></li>
</ul>

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